Of lemons and buttons

A group of young learners took part in this year's Jugend Forscht competition. They have developed a machine that can be used to store music from streaming services on a magnetic tape so that it can be listened to offline later.

However, they are not yet sure how to power the "recorder". Aysenur suggests using a lemon battery, as it only consists of items that anyone can easily obtain. Sebastian still finds this too complicated. He would rather have a solar cell on the machine, even though that would probably be too expensive. Finally, Kim comes along and has a small silver disk in her hand, a so-called button battery. This is supposed to generate more voltage because, compared to the lemon battery, a silver electrode is used in addition to the zinc electrode instead of a copper electrode. It is also supposed to be cheaper. Sounds almost too good to be true.

The group decides to test the claims and set up two galvanic cells.

Task:

Use the widget below to simulate the two batteries. Find out what voltages the batteries supply by creating the missing components and creating a circuit for each. Then explain which battery would be more suitable. Is only the voltage relevant here?

Notes on the widget: